ZeroTech Optics show the various features and functions of their Trace H.A.L.O. Red Dot Sight... "This Heavy-duty Aspherical Lens Optic (H.A.L.O) reflex sight excels in extreme conditions with its waterproof, shockproof, and fog-proof design. It features a 3 MOA Red Dot reticle with ten brightness settings, including options for night vision, ensuring clear visibility in various lighting scenarios. The aspherical lens offers a wide field of view, enhancing target acquisition and situational awareness. Thanks to its top-loading battery design, the sight keeps alignment and zero uninterrupted during battery changes, making it a reliable choice for any shooting activity."